you're finding your current character boringly easy and than you want to start a new game with a fighter-mage? [img]smile.gif[/img] if easy == boring for you than definitely don't play a fighter-mage (dual or multi).
however, if you want to spice your gaming experience up a bit, you might want to consider downloading a couple patches that make the 'boss-battles' in ToB significantly harder.
get them here if you're interested.